Precision 3630 Tower Service Manual

Removing the power supply unit

1. Follow the procedure in Before Working Inside Your Computer.
2. Remove:
   1. Cover
   2. Heatsink assembly
3. Open the PSU hinge
4. Disconnect the following cables:
   • For systems shipped with 65 W/80 W CPU system configurations:
     1. Disconnect the optical-drive power cable from the optical drive [1].
     2. Disconnect the CPU-power cable and system board power cable from the system board [2,3].
     3. Unroute the CPU power cable from the routing guide on the chassis [4].
     
   • For systems shipped with heatsink assembly for 95 W CPU system configurations:
     1. Disconnect the optical-drive power cable from the optical drive [1].
     2. Disconnect the CPU-power cable and system board power cable from the system board [2,3].
     3. Disconnect the graphics-card power cable from the connector on the graphics card [4]
     4. Unroute the CPU-power cable from the routing guide on the chassis [5].
     
5. Close the PSU hinge.
6. To remove the power supply unit (PSU):
   1. Disconnect the hard-disk power cable [1].
      NOTE:There could be up to four hard-disk power cables depending on the quantity of hard-disk drive installed.
   2. Remove the two #6-32x1/4'' screws that secure the power-supply bracket to the chassis [2] and lift the power-supply bracket from the system [3].
   3. Remove the four #6-32x1/4'' screws that secure the power-supply unit to the chassis [4].
   4. Lift the PSU off the chassis [5].
   
7. Disconnect the wiring harness from the 95 W CPU system configuration.